This vehicle features a 6-pounder gun fitted in the A27 turret. Only one prototype was produced, after which development was discontinued due to complications with the turret mounting. The vehicle never entered service.

This experimental version of the Pz.Kpfw. IV Ausf. G, incorporating hydrostatic drive, began development in 1944. Trials were discontinued due to the unreliability of the transmission and the lack of spare parts.

The Type 3 Chi-Nu Kai medium tank is a combination of the Type 3 Chi-Nu suspension and turret and the Type 4 Chi-To gun. Only one prototype was built. It was ready for trials in March of 1945.